Office



G. DALN. INCANDESCENT GAS FLASH LIGHT APPARATUS.

APPLICAION FILED :IULY 31,1914.

Patented Oct. 28, 1919.

279% l s@ i ATTORNEY y eUsrAF DALiiiv, or STOCKHOLM, SWEDEN.

Vfltoclrholm, Sweden, have invented certain new and useful Improvements in Incandescent Gag Flash-Light Apparatus, of which the following is a specific-ation.

My present inventionrefers to` improve! ments `in incandescent gas flash light apparatus, andhas for its object tog-make' the incandescent body lastfor a longer time than hitherto has been the` casel lt has been proposed when using a lflash light apparatus in combination with'can incandescent light burner, to place the pilot flame outside the incandescent body, in which case however the gas or gas air mixture. escaping from the main burner, is compelled to pass through the incandescent body or net at each time` the main fla-nie is to be lighted. The incandescent. body 'thus is filled with gas or gas air mixture which results in a small explosion, when the pilot llame lights the Amain flame, whereby the incandescent body is caused to vibrate, being A thereby injured. As for establishing flash light signals the main flame is lighted and extinguished many'- times a minute, the inc-andescent body obviously is sub-ject to a considerable strain. lt has also been proposed to place the Ipilot flame inside the incandescent body or net, but even in this case, a small explosion, causing vibrations ofthe incandescent body, takes place each time the gas, flo-wing out from'the m-ain burner, is lighted by the pilot flame.V

Now the invention in question has for its object to obviate said inconvenience by omitting the pilot flame, feeding the main burner with unequal amounts of gas or gas and air mixture, a large supply of gas or mixture of gas and air producing a Vflame of sufficient size to contact with the incandescent body and cause it to glow and a small quantity of gas or mixture of gas and `air producing a small llame which does not touch the incan- Y descent body. As in both cases a flame is burning in the burner, there is norislr for explosion at each time the incandescent body is made glowing, and for this reason said incandescent body is caused to last for Va longer period of time than when using a pilot fla-me.

Figure l on the accompanying drawing illustrates in side view, partly in section, an.

1 apparatus embodying the `present invention..

i. l Speclcation of Letters'Patent.

Application mea July s1,

Patented Oct. 28, 1919.

1914. semaine. 854,237.

Fig. 2 is a simil-ar v-iew of a modified construction of apparatus, and V `Fig. 3 illustrates a plan of a flash light apparatus, the cover of which is removed, provided with a device, by means of which the same function is obtained `as in the apparatus made according to Figs. 1 or 2.

` In Fig. l, l indicates a flash light apparatus of `any suitableconstruction, comprising an automatically workingvalve, opening and closing the conduit 2, leading to the incandescent light burner 3 in certain intervals of time. -lindicates the inlet pipe to the flash light aaparatus, through which pipe gas or ya mixture of gas and `air is admitted to the flash light apparatus 1. 5 indicates a gas conduit, arranged between the supply pipe 4 and the burner conduit as a by-p'ass around the flash light apparatus l, and adapted to supply a small amount of gas or gas air mixture to the burner 3, when theyalve of the flash light apparatus shuts off the gas supply to the burner conduit 2. lVhen said valve again opens the burner conduit, `a larger amount of gas or gas and `air mixture is supplied, to the burner, whereby the small flame burning in 1 the burner swells up to a. full flame. Thus in Vsaid burner 3 according to the circumstances a small flame is burning, or a full flame, the latter making the incandescent body glowing.

Instead of being passed or conducted through a by-pass or gas conduit 5 the gas maybe conducted through a by-'pass around thevalve in the Hash light apparatus to the burner conduit 2, as shown in Fig. 3.

In Fig, 2, an apparatus is shown in which a small amount of gas or gas air mixture is-supplied to the burner 3 from a receiver 7, which is connected by a pipe 5 with the burner conduit 2. To the flash light apparatus l gas is conducted in this case through the pipe 4, and air for establishing a complete combustion is supplied to the burner conduit through an opening 8. VThe receiver 7 is closed by means of a diaphragm 9 and is fed with gas and air mixture from the burner conduit 2 through the pipe 5 during the time when the flash light apparatus l supplies gas to the burner conduit 2. When the valve of the Hash liglitapparatus shuts oil" said gas supply a smallamount of gas and air mixture is fed to the burner from the' receiver 7 through the conduit 5, so that the full llame,- previously burning, will be diminished and the incandescent Ibody will not Abe glowing. A check valve 1l in the burner conduit 2 prevents the gas and air mixture from flowing out through the opening 8. The pipe 5 in Figs. l and 2 may be provided with a suitable throttling device.

In Fig. 3 l0 indicates a by-pass, arr( nged around the valve 6 of the flash light apparatus, through which lay-pass a small amount of gas or gas air mixture is supplied to the burner conduit, when the valve 6 is shut.

Having now paiticularly described my invention and set forth in which manner the same is to be performed, what I claim is:

ll. In a flash light apparatus, the combination of a gas receiving casing, a supply pipe for supplying gas from any source to said casing, a conduit for conveying gas from said casing, to a burner provided with an incandescent body, a valve for opening and closing the opening from said casing to said conduit, means for introducing air into said conduit wherein it is mixed with the gas therein, and means independent of said casing for supplying a reduced quantity of gas and air mixture in unchanged proportions to said conduit when the said valve closes said opening from said casing to said conduit.

2. In a flash light apparatus, the combination of a casing for receiving gas from a source of supply, a conduit extending from said casing to a burner, a valve which periodically opens and closes for controlling the flow of gas from said casing through said conduit to the iburner, the gas supplied to said 'burner :being mixed with air, and means for supplying a reduced quantity of gas and air mixture in unchanged proportions to said'burner during the periods when said valve is in closed position.

3. In a flash light apparatus, the combination .of a casing for receiving gas from a source of supply, a conduit leading from said casing for conveying gas therefrom to a burner provided with an incandescent body, means for permitting air to enter said cond-uit where it is mixed with said gas, a valve for opening and closing the passageway from said casing to said conduit, a receiver and a connecting passageway between the said conduit and the said receiver, said passageway having connection with the said conduit at a point ybetween that where the air is introduced into said conduit and the said burner for conveying a mixture of gas and air from and to the said conduit whereby when the said valve closes the passage way from the said casing to the said conduit a mixture of gas and air is supplied to the latter and to the burner from the said receiver.

et. In a flash light apparatus, the combination of a gas receiving casing, a conduit for conveyinggas from said casing to a burner, provided with an incandescent body, and means for periodically supplying unequal amounts of a gas and air mixture in unchanged proportions through said conduit to said burner,

5. In a flash light apparatus, the com-bination of' a gas receiving casing, a conduit for conveying gas from said casing to a burner, means for mixing air with said gas to produce a gas and air mixture and means whereby unequal amounts of the said gas and air mixture in unchanged `proportions are supplied periodically through the said conduit to the said burner.

6. In a flash light apparatus, the comb-ination of a conduit for supplying a-mixture of gas and air to a burner, means for causing the mixing of air with the gas and means whereby unequal amounts of the said gas and air mixture in unchanged proportions are supplied periodically through the said conduit to the said burner.

In testimony whereof I have aflixed my signature in presence of two witnesses.

' GUsTAF DALN.

Vitnesses GRETA PRIEN, WALDEMAR BOMAN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, ID. C. 

